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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368143a7e747e09719128467f76c0bbea989a1b8fcf2e595dd662747ade8f83b' 
  AND token = 'LfPv7woi1BMWTkZb4BDcOSov0Jf2rNXWjVTN1ipRsbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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