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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4bf81872bfa9183aafd22f29743765079c8a8f7e2f2c38855b30b126f2c222f' 
  AND token = '0h1v4hI8EMGWcpANOji8/Q6Tu8eYcgOof3jyucDh7lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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