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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e712da6b27cfea633baf7be7cd4be299bb6c5e1681123949825c5563fb4023cf' 
  AND token = 'rc9R+JPjB6SHIDb5Gtk0/wrrGF0t3bJko023JwP0mks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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