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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9301da2dbaf3cee8c5944fdabd24e50de533c3659c21c2aeba811cd72d2a3696' 
  AND token = 'zxtLIXZXhAC5mfrcaxZrPaom45hUf91cBE92iLdaBYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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