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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c0d252b181c741b36aa79b831a417bee2e21d39c71010408b6dddf42f8ac0f' 
  AND token = '7ieB3tHJ0Rw0/Q3kJq+8alYwFoX6boPonJFcm0dfxyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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