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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6993b1a24168a2ef44588c6d36a24edf3e0441935202ff4323afbd94086745e1' 
  AND token = 'gSW5FuXcAszJht6l3IuUUM4p3VzIzQ76Wim1whsol/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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