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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1f8e3c3f4bc663245b2fecf30f6f657bff567f13f1dc4a0336012dccd5edab' 
  AND token = 'x+BEHOEw6S//3wvcBL7thmjtIknUm5jA0oKoINL1Lk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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