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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec98e9fbc589c44d2d82b505a0dc97fd64c11deae87d9e9b2703c12ac07676d0' 
  AND token = 'CwJq8m2/8U8ma812UYC2JvGryCSmSyPwZx6Y0Y+kLtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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