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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f8740d006d48cad98651ae48b8c031d57df6bd4fff1caa09b15818135182cb' 
  AND token = 'MSs/y5H+CldyyV/ECjGu4jjHTD6vyJBTT/6+nsVLrbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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