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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18d6805297646ddd7d43a0ea58c565156e02c4c38233d65d49987d2c27314ea' 
  AND token = '/4pBJkvREmbJZCtZ1TKIOeMl3tu+n9305rBUQ6c/Gt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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