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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab8798b82a2c67c8b66309fc4aac15488c5ae9d2394e93f869777be5e7a0606' 
  AND token = 'xPax6cD8cFnjiZ9tIR1tPy0N4lJwwrrQk7xLigbBzwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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