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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8eccd4cb09342cd0f2724f313d9feadea6a36338c20c67dc0ac570a02831fd' 
  AND token = 'ty/FmbM/V9qqguVUNjfjO80coiwmeikm29ft0tSu/P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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