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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d8f2f517f3ff0b6bbf9920ea4bbe9e0f5fc1085ebdc0c165f16c9a23295ea0' 
  AND token = 'JsvzsAhKHgBQilsBNpdznbhA5lCOk6l6v8Gk0iMn6PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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