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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0087400cd9892cd64ce35f480980c52d50c6f78ebb58d67c185c58b82cca20' 
  AND token = 'LyZj3jEUbyslGAQuQjgs7fnhFl/+2aeEb9jfgEMgZDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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