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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd7e430e8f795c583651ca79f602d7cebcbe04754b2e414e4e6cfc3d371df7a' 
  AND token = 'ExOqQ22t5BGTiuZ7OHZ0ydH3aWoJauUTMLxkjuiTCNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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