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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a81e3c6184db0ad7d7d165e3ee786aca3089359faac40a6eecd587673e9dc78' 
  AND token = 'qkd2Lv3o7pLsuYeO/nbxbAD4EXzGFiM2TG6GrVC4FkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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