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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c4117edd0fb02fe6e95688181fa8216f11806c8813e349ad229121ac0b8488' 
  AND token = 'bz8Iay4g+WqXF16oVK2S9MxMZD7faoWjw+2MMnKOeSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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