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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbaadfb0651d2420f949b0bd69f7d1074f07838ceef2c7645f347c6fd04e7f8' 
  AND token = '3baIUeR/m1xRxj2xEsNZJeyS5FsbduhwS2/acF8nMbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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