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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c19f4813818785c2007cbebd8d3df7969ae316f9345c1db802423240a180b6d' 
  AND token = '3CpOVPmSYmcRwgVSZeOMEMfgV6ued2BJNbNXwnvS4VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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