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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e152996f8f5ce1316449aa7050b975867c017eacc35fafd961334a528f0062' 
  AND token = 'vCxxBFQ949rWJDYYpwdsyKp+cE2jbUMLk8BdMUCGNyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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