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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14127f49d3cf3194b19d0b55179e127c8d665f553d8cacbc2569b9b4266e0d1c' 
  AND token = 'NuX+ZEt+2fK4iS+jHxxICwsXt9i40FmXnu85juaaToE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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