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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f715497a5da7ed109c89fc050959749ae83874d44381bd0b42998a6a2e996c43' 
  AND token = 'mzF0rGk4+3kgufjHA0ZmQZyG3+DCAhkYcx8phRPIcnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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