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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab348c0d1cc6b9342225c21a2cbf4d3830549c22df3db9e27a5ee74bec9647e' 
  AND token = 'zg5pf1BpXm1rn6TMK5+d3Fn8I/ZjmNDzaFZkBWIk1Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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