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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee49223b6d8d98dff6dc1fbf5662fa92203421d0958a19708929d4db34c4aae5' 
  AND token = 'NWb2MF/IbNGKfBCAbRNmZDi+i1V1nqRycpzc8nZy//8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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