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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93b20c799c411dc3669208b87c0c8c6599d4a9ad83772588e9e8025f435ed0c' 
  AND token = 'oyk8ZMKvoZumFSQqjIuIq6r4RhHvpQF54fmU5wIONU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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