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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7f04d931f0b88fae5b9b919c2e67219c2563fc3f7f361cdbaf7df2f99bbaa3' 
  AND token = '6GLREXoyTtlUFZWnkZBY8MR+NC/iQN6CPD3R67H1790=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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