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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91bc28a2dcbf0630c98278e457122ae85cf513d938f6e0d8c0d3e8c9fe71d95' 
  AND token = 'iqRbawZhxI7y9ESg1LhMgf53IiQEjfAa66gw2NE1r78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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