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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f78ae58c71c9f948e3c547edd0019cd6126cfc206c9ef2c6c0f2ea6af9cc21fd' 
  AND token = 'rlF45lNJBPnDGGB7jb46gvGmROYZLm0G26Sb2CL/QKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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