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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82dddaaf745db81c6b681cd04e40f18ce5895260c27d38128a77d942e2b588b0' 
  AND token = 'D/IQ/gjI0/8U4hsmazk50uGSnmHR1kUx1zyXbhp1GEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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