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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6f408857120fcbff367b2697d6e0cd8c15b3dc3ad2ee4b1c3e39fbb1e767b2' 
  AND token = '7Xzp+zdrfFVPxw3+A/ZYkkRh2d40g1fYMcUe7AtdOCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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