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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3457d62f1f55eafc14f54115dfb4969843dc35e9b559e60ebbfa462cd9816b5' 
  AND token = 'IX0C037wM0j9ddspZ/S0n7HTXvKwi0U2CtA/2dSeeMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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