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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9125e60bfa2d3b961ade8fc0d913dbc4e2f9e29c3cfd6d699747b3673edc3eb1' 
  AND token = 'k8CBjCcMLyfsDtsddLVTPIr++aU7/3ZZsOehcvVLPbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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