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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf26fbc070af1b72f0b2a99deabc6e7dc8dbfa4b65af7785bc53441b2da97417' 
  AND token = 'Ek0QJmBZMdbDa9GmYHCZ2VwYuMHQXcLP0SxRoFJf5LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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