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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1429bfad9e2d57b953f6596f979dc879ad554e1e447191458e5fe24b2c9d5131' 
  AND token = 'TvBE/8YrNiMJa5k1Ey6ogzzshO9YsJSh0Yw38So5CxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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