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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a1c66143d4a4dbdbebd3f84e0dd44b1df4df34ea356fe53ffd6f1abde4deb9' 
  AND token = 'v8uaj3zTJdJ6G1Zq+Qe/dyWmyZoXQHpeRpOHbGs0ByQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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