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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b013cc716bae66c5da609083b3616f7c76e37eadf8788e963c29a90847658505' 
  AND token = 'tWSwVhgknru955YHP7CNFhA1DQ0i1kuTns7tsTAg8S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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