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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cd2ca835dffbdaa9d287826ce0a214e94a10036b6cc7bd35e137ef22815964' 
  AND token = '7gAL1dcG9tktXBLzh3NXQ2nKB7uPjssd0TNONmfTmho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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