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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3b9b73c8c8752f1a8d66874e9483ee35ea174599b757d32b55bb0acc235028' 
  AND token = '0Ql+/C96tBsQ8tvEGNC7K/uS34SgQOl0r6nT5nudco4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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