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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbd270948356828241d7af574cf9ec85754c755fc9e21c8c4a1d2e45ec0fb0e' 
  AND token = 'QZ7GI+huCVfzIDjoAcOQ4UEeC0ZsEZNaY8n1xxE6DGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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