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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1196e46481a2154baab0c78bbb716a969098fb64679b60bf034f6372a56c6d31' 
  AND token = 'OFXb/G93mXAy7Fdt9qw7jU/pXTes1zdvzf2/ug1P7fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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