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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606cef6e4001b7f8af7db857b13471250b4df183d6c3349b3e9db76ccd1a2a84' 
  AND token = 'VJ9pCIuM48Usrjkh4VTa1l6CxMMVZzeruKfh6e+5fKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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