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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2262cca566654426cda66ac82374f1f58a99668b31bef662f260c905fc860b5' 
  AND token = 'SEkj+gq0md0AOLwnLohnqR3fCR6Ffn7QY6PFWxiMVe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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