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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1ad5983517fbd0841b6a377423cb2589c4aaabd6989747464b8c4abd8b3f6e' 
  AND token = '6DgW/7Grxlgn+TpaCGxt13EMQXLbon1I34gDtw5zWsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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