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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35c1b71fd197d741ec8a372a7eff9626c0cdabbce622e74e9fde620d23cd5976' 
  AND token = 'cvNy0/pcEVk6zpb6YPIbfYpJo6v6vHsEQmJl2OJHjj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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