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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95dc4b0e4ce1bb9de96c3719fbf4018e2df7b932a19c7d2b860c779ab8db0ba' 
  AND token = 'ZMEgB2y4dkMufdhXNLlOSXCqWO4c2z07KiI98vcMkAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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