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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1400581b622fc0c95a6ed992b76fd02b06b543995f294a21d1a92e859f8ee5e' 
  AND token = '7LFqKUN0sehtAQyeO+FkkrwJYqJ+JHmd8/2ZB1xO8EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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