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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc14dfe4bffd9d352f28eae0e6fbe3d6e2ab6773933174f3caf89c0f3a0553e6' 
  AND token = '0OqHznNyAO0t4wIvje2Vx7Ou1fremq7O1s6M6A1PaAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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