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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc06977896a418d6ffdb8b7bc160c6e9f0e8dccdbe77ea7d316fc0fe0a7cb71' 
  AND token = 'rBN2fGV0unhp0asd6OFjdMZe9UmH2IbYWe+Lr/l23oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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