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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a4f91ca6aaa906942dd459210d276b347f1987c6cf64f839eb2e4ff48f7adc' 
  AND token = 'Sg0XC3KtWcCXRyoh/iZl5Djk1ZMJFybHynErKXPVL/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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