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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3400fa12c39137856a8dbf7d015f0b83a52eb12e2fb4bf1dbe65d985b53063' 
  AND token = 'FhiFP306tgeMcb0HiSvMf5MAxlykHf2eNAdIsudGuGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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