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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9608182e3876d53f21123f2e0dfc0f7278c70e9a7b68c44b4efc1a2880bbd9e6' 
  AND token = 'fnd3h7rp0wAViQdEYYBYO27wtVetYEKHndYzXCaWo1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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