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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b6e38e31207cdeb1ea9202468c565af7a630f23d2f8072f1dd2c2799cbf3f6' 
  AND token = 'unVaS7tV8nmcxc0AFv/8PkXge8+veQMUofrSstmCooQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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