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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4875eac87496bc5052ff5ea17758b8011bab8d45a1fa23be54b9cc4f72f559cc' 
  AND token = '3LKvFM7sh9Jr/Ni6gZvIgH+u98+PpAC3TkkoubObjR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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