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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254f0e718a87c59a966bbdb61511d3747a90d52de3a33c8bed013ab1d6c20ef0' 
  AND token = 'n6mjyzqO9Xtk6AHFfwvIsCQGecpz74gx8ubiYKaLu84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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