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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9764b2e26b421d033379ba490fe0c6a5c1b3597f5d8a4e66b1db04ca26085762' 
  AND token = 'eqfDNS/MrX1yH57u4BmZZ30Pifezj9gmExGFh06uo18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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