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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0593a7fc3d22f09d5f1e45c2e0d9e037024540718f02c3f8c238176ebf9893' 
  AND token = 'r8w4ECWSM/qrOyzW5Ptaz/BuDZ1IGaBUlPg30cbGgiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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