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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f54dae01b28d096067e9bd5b340fa5cd198a3fd40c3778e91336ec4b97e4c7' 
  AND token = 'PF6s40UzC6GDrcXY1/SVZpady6X4g97OAoFZwI7ksAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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