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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6955f9907122b3216401b10de4a94b86aa135e75993f0cb1b061c507aa0e5a12' 
  AND token = 'U5uYOGnG7DE0FFsR5oVo46HHKLgIvnQqN8lx5xpjKIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}