SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0b599ba0138f2306fec3bc5248977ab48bedce2dbbc948eafe31d521484aa5' 
  AND token = 'w34B6DGIHOnRrjOqZCjFEprIHsBV7Y5Ty7/6/HppX60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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