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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50aa4cb48815efbe338f041e121971aa7da093a49bd92116572fc9228a72b87' 
  AND token = '5l182fFQ7cmNbu8hRZJHLedR8VT5FNpPu8ZCQ3lkBbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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